Battery.



PATENTED JULY 10,-1906.

C. W, HARPER.

BATTERY. APPLIOATION FILED APR. 8, 1004. RENEWED JUNE 12, 1906.

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BATTERY. v

Specification of Letters Patent.

Patented July 10, 1906.

Application filed April 8, 1904. Renewed June 12. 1906. Serial No. 321,387

To all whom; it may concern:

-Be t known that I, CHARLES W. HARPER,

citizen of the United States, and a resident of Malden, in the county'of Middlesex and State of Massachusetts, have invente new and useful Improvements in Batteries, of which the following is a specification.

My invention is a portable telephone system particularly adapted to be carried and used by deaf persons.

Systems of the class referred to comprise a single battery-circuit, in which are arranged a transmitter, a receiver, and a battery.

In an a plication :filedby me September 12,- 1902, Serial No. 123,060, I have shown and described a transmitter particularly adapted for use in a portable telephone system for deaf persons'in which the transmitter is so constructed that its action can be regulated to accord with the necessities of the individual by whom it is to be used. As is obvious, difierent degrees of deafness and differences of or anic disease may require different degrees of oudness suited to the needs of the particular individual who uses the system. The transmitter referred to is arran ed to be so adjusted as to cause the receivero thesys-- 'efiective action for the needs of the user might be achieved.th at is to say, such an adjustment is given as gave the desired volume of sound with the maximum clearness of articulation attainable.

It will be obvious that -in considering the volume of sound produced in a telephone sys tern two factors enter infirst, the instrumentalities (transmitter, &c.) by means of which the variation in the current is produced, and, second, the strength of that current.

My-prior application provided for adjustment of the st factor, and so long as the second factor remained constant the adjustment was right. In practice, however, it was found that the current from the battery was of a constantly-decreaSing strength, he cess'itating' more or less frequent changes of adjustment in the transmitter to compensate for this change in current strength. In my present application I have arranged adjusting means by which the current strength may be kept practically constant by the most sim ple adjusting means, so that the delicate and careful adjustment which is required in han-' dling the transmitter is dispensed with and I ordinary persons can keep the system in its most fully eficient condition. To accomplish this end, I employ a rheostator other equivalent variable-resistance device in the telephone-circuit, by which the resistance in the line may be varied according to the strength of the battery used and to the articular adjustment'of the transmitter an receiver, and at the outset when the battery is at full strength I make the necessary adjustment of the transmitter to give the desired results to the user of the system with a considerable portion of the resistance of the rheostat thrown into the circuit, so that as I the battery decreases in strength resistance may be withdrawn and the effect of currentstrength will remain practically constant, requiring, therefore, no change in adjustmen at the transmitter. j

' A further object of my invention is to rovide a compact and convenient pocketattery of im roved construction, the novel fea tures of wffich are hereinafter pointed out, together with other features of my invention.

In the accompanying drawings, Figure 1 is a diagrammatic view of my improved tele phone system. Fig. 2 is an elevation of the pocket-battery hereinafter described. Fig. 3 is a plan view of the pocket-battery shown in Fig. 2. Fig. 4 is a central longitudinal section of the ooket-battery shown in Fig. 2. Fig. 5 is an e evation of one end wall of the box hereinafter referred to. Fi 6 is a bottom plan view of the end wall S lOWIl in Fig. 5. Fig. 7 is a detail hereinafter described.

Havin reference to the drawings, A represents a hox which is flanged or flared at one end, as at a, to enga e an 'inturned rim 0/, provided on a remova. le cover a Cover a can. he slid on or off the flanged or flared end distinct and leeble or else interspersed with ends ol lwosleeves 15 and u", made, respectively, with heads or {hinges (17 and a. On these two sleeves (1 and a" is mounted a plate (1, also ol hard rubber or the like, said plate (1. being; l'astrnrd in place by a nut (1, screwed onto the threaded end of the sleeve 1:". The wall (1 and plate a are held separated by two bosses a, whichconstitute the shank or body ol aspeol, of which 'wall (L l'orms one llange thcrcol and plate a"'the other llange thereof. On the bosses a is a winding one end of which is connected with a contact (1., herein shown as a screw mounted in a boss (1. n'ovided on plate a. it intervals throughout its length the vinding (1 is connected with a series of hired conlacts c mounted in wall (0 and arranged in the path ol' an arm e'l". ,'lhe arm (1 is pivoi'all mounted upon a screw (1 lastenedto the llan e'e (1 ol' sleeve (it.

One electrode of batteryB has fastened to it a spring-contact al which presses against contact of, and the otherelectrode of bat tery B has la; toned. to it a similar springcont et a which presses against the end of The sleeves o and a constitute sockets for plugs u? and a, which are the terminals of the telephone-line. The core of the magnet forming part of the receiver R is, as usual, polarized, and in order to insure the terminal plugs (2 1 and a being placed in their proper sleeves the internal diameter of sleeve (1/ is made less than the internal diameter of sleeved. Terminal pluge is made ofa dirguneter to lit sleeve (1?, while the other'terminal. plug o is of larger diameter to it sleeve (1. By this construction it is made impossible to connect the terminals oi the line improperly with the sleeves (L5 and a; in which. case the current passingthrough the windings of receiver it would be opposed to the polarity of the core of the magnet of rereiyer lt.

In telephone systems of this class the transmitter T andreceiver R adjusted to suit the particular degree of deafness oi" the person' who is to use the system, and for best results the battery-current on the line Xshould be proportioned to the particular adjustment ol'the 'a'nsmitter:nidreceiver. Otherwisethe opera tion otthc instrument will be defectivethat is, il the current is either too great or too little for a particular adjustment of the transmitter and receiver then the operations o'l those inslruments will be defective and the sounds produced at the receiver will be inil'ijectiomible crackling or -boiling sounds. 1 ill properly positioning the arm a", however, the current on the line can be regulated to accord with the adjustment of the transmitter and r ceiver, and/as the battery decreases in strength through 'use the current can be maintaiiwd substantially uniform for l.

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the curre'i'it can be regulated at will to com pensate for weakening of the battery through When battery B exhausted, cover a" is.

slid off from the end of box A and the battery removed for the purpose of substituting a,

fresh one. \Vhilc battery l?) is in place within boX A, it is pressed by the spring-contain:ts (l/tand (1? against the cover 11 and serves to hold the latter in place. Also these springcontacts a and o serve to hold the battery from moving about.

The pocket-battery above described is exceedingly compact and convenient, as well as particularly adapted for a telephone system of this character. All of the parts except the arm a are inclosed and shielded by the box A, and the end wall (1 in the form ol a spool not only carries the windings ol the rheostat, but the sleeves and all of the contarts, and these parts can be assembled on said wall a" before the latter is placed in position. itioreover, this end wall an be removed at any time for the purpose of repair or adjustment of the parts carried by it.

It will now be clear that in my improved pocket-battery two contacts, herein shown as consisting of the screw (1. and the inner end of sleeve (1 are providedu wn the interior of the box within which the battery I) is placed, and these two contacts are connected with the two electrodes of the battery; also, that end a of the box is in the term of a spool upon which the winding (1 is mounted, also upon the interior of the box, ilrtherefore being protected, so that it cannot accidentally be disconnected from the fixed contacts a or the contact 09".

lVh-at I claim is- '1. As a new article of manufacture a box. for pocket-batteries lu'iving a pair of contacts upon the interior thereol to connect with the electrodes of a battery, one of said contacts being connected with a sleeve adapted to receive one terminal plug of a circuit; a number of resistance-coils n'iountcd on said box and connec ted. with the other of said contacts; a number of liXcd contacts also mounted on said box, each. connected. with one of said coils; a movable contact cooperatively arranged with relation to the liXOLl contacts, and h sleeve connecad with said movable contact adapted to receive the other terminal plug of said circuit.

2. As a new article of immutacture a box for pocke t-batteries comprising a pair of contacts upon the interior thereof to connect and a with the electrodes of a battery, one of said contacts being connected with asleeve adapted to receive a terminal plug of one size; a number ofresistance-coils mounted on said box and connected with the other of said contacts a number of fixed contacts also mounted on said box, 'each connected with one of said coils; a movable contact cooperatively arranged with relation to the fixed contacts, sleeve connected with said movable contact adapted toreceive aterminal plug of another size. i

3. As anew article of manufacture a box for pocket-batteries comprising an end wall of insulating material, a pair of contacts up on the inner side of said wall to connect with the electrodes of a battery, one of said contacts being a sleeve embedded in said wall and adapted to recelve oneot the terminal plugs of a circuit; a number of resistance-coils mounted upon the inner side of said wall and connected with the other of said contacts; a

number of fixed contacts upon the outer side of said wall, each connected. with one of said coils, a movable contact upon the outer side of said wall and cooperatively arranged with relation to' the fixed contact, and a sleeve embedded in said. wall and connected with said movable contact adapted to receive the other terminal of said circuit.

1 e. As a new article of manufacture a box for pocket-batteries comprising a tubular body portion; adapted to receive a battery within it; a removable cover for closing one end'of said body; a fixed wall of insulating material closing the other end of the body; a pair of contacts upon the inner side of the fixed wall adapted, to connect with the electrodes oi" the battery, one of said contacts being a sleeve embedded in said wall and adapted to receive one of the terminal plugs ofa fixed wall, each connected with one of said coils, a movable contact upon the outer side of the fixed wall cooperatively arranged with relation to the fixed contacts; and a sleeve em bedded in the fixed wall and connected with said movable contact adapted to receive the other terminal plug of said circuit.

5.' As a new article of manufacture a pocket-battery made up of a box comprising a tubular body portion; a removable cover for closing one end of said body; a fixed wall of insulating material, closing the other end of said body; a pair of contacts upon the inner side of the fixed wall, one of said contacts being a sleeve embedded in sa'idwall and adapted to receive one of the terminal plu s of a circuit; a number of resistance-c011 s mounted upon the inner side of the fixed wall and connected with the other of said contacts; a number of fixed contacts upon the outer side of the fixed Wall, each connected with one of said coils;1 a movable contact upon the outer side of the fixed wall cooperatively arranged with relation to the fixed contacts; a sleeve embedded in the fixed Wall and connected with. said movable contact adapted toreceive the other terminal plug of said circuit, and abattery within said box having its electrodes terminating in springcontacts'to engage the pair of contacts upon the inner side of the fixed wall.

SignedLby me at Boston, Massachusetts,

this 4th day of March, 1904.

CHARLES W. HARPER.

Witnesses:

ARTHUR F. RANDALL, JosEPH T; BRENNAN. 

